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Installation guide WZ-FC 778
General
The compact mechanical single or multiple jet thermal energy meter WZ-FC
778 is a precision measuring instrument approved for individual metering of
heating systems and must be handled with care.
The WZ-FC 778 is available in a heating or cooling version and determines
the thermal or cold energy exchanged by a heat-bearing fluid in a heat ex-
changer circuit.
The WZ-FC 778 complies with the requirements of the European Di-
rective MID 2004/22/EC modules B and D and of the standard EN 1434
class 3.
Important
The energy meter may only be used under the conditions indicated on the
manufacturer's rating plate! The seals must not be removed or may be re-
moved only by authorised persons.
If these conditions are disregarded, the factory warranty and the calibration
will no longer be the manufacturer's responsibility.
Do not shorten the cable between the flow meter and the integrator and the
cables for the temperature sensors or modify them in any way whatsoever.
Before installation
Check the installation data and compare them with the specific characteris-
tics of the thermal energy meter.
Installation
The prescriptions related in the standard EN1434-6 must be respected when
the WZ-FC 778 is installed.
Depending on its particular version and use (heat and/or cooling me-
ter), the energy meter must be fitted on the "cold" or "hot" pipe side of
the installation in compliance with the indications showed on the LCD
st
display, 1
position of the service menu "hot pipe" / "cold pipe".
Place the flow meter correctly according to the direction of the fluid (an ar-
row can be seen on the flow meter).
The energy meter must be fitted between two shutoff valves. The flow meter
must be installed ahead of any monitoring valves so as to avoid any poten-
tially interfering influence.
In any particular installation, mixed mounting positions (horizontal and verti-
cal) must be avoided.
Final commissioning must be performed and documented.
All other information can be obtained from the enclosed Installation
guide WZ-FC 778: www.nzr.de
The QR code located on the label of the carton
or on the integrator allows to access to the in-
stallation guide.
Wall-mounting of the integrator
The integrator can be separated from the flow meter and fixed against a wall
using the wall fixture supplied with the energy meter. If possible, install the
wall fixing component above the flow meter.
Mounting the temperature sensors
The temperature sensor cables are provided with a coloured indicator plate:
Red for mounting in the pipe on the "hot" side.
Blue for mounting in the pipe on the "cold" side.
The temperatures of use shown on the label must be respected.
A temperature sensor may be fitted directly in the flow meter. The tempera-
ture sensors will preferably be fitted directly, in other words one temperature
sensor will be fitted in the flow meter while the other sensor will be installed
on the other side of the heat exchanging circuit.
Asymmetrical mounting is also possible. In that case, a temperature sensor
will be fitted directly in the flow meter of the energy meter while the other
temperature sensor will be fitted on the other side of the heat exchanging
circuit in a sensor pocket defined according to the table set out below. To
guarantee accuracy in this type of use, the following conditions must be re-
spected: minimum temperature ∆T
than ≤ 100 l/h.
Make sure that the sensors are mounted until they stall with the bottom of
the sensor pocket.
Temperature sensors
Ø 5x31 mm
Ø 5x 31 mm
Ø 5x 31 mm
Ø 5.2x 31 mm
Ø 5.2x 31 mm
Montageanleitung WZ-FC 778
≥ 6 K when the minimum flow is less
min
Pocket
Article number
M10x1
0460A212
G3/8"
0460A213
G1/2"
0460A214
M10x1
0460A215
G3/8"
0460A216
Error codes
Err 1: Flow higher than 1.2 x qs or defective hydraulic sensor.
Err 2: Measured temperature outside the homologated range or temperature
sensor defective.
Display
The WZ-FC 778 LCD display has been designed to be large enough and per-
fectly readable by the user.
Mounting procedure
1. Flush out the installation pipes carefully
2. Close the shutoff valves before and behind the meter.
3. Open the drainage valve to reduce the pressure and discharge the
water contained in the pipe.
Single jet meter
4. Consider the direction of flow circulation.
5. Place a gasket on each side of the flow meter.
Only use appropriate new gaskets.
6. Tighten the fixing nuts firmly by hand. Then
tighten up to the mechanical end stop using a
mounting tool.
7. Turn the display into the desired position for
reading.
8. Check the waterproof of the meter placed un-
der pressure.
9. Seal the flow meter and the temperature sen-
sors.
Coaxial multi jet meter with M77x1.5 connection
4. Consider the direction of flow circulation (EAS
base).
5. Remove the blind cover or the old meter from
the EAS base using an installation spanner.
6. Remove the pre-formed gasket then clean the
contact surfaces and the thread.
7. Place the new o-ring in the EAS base. Make
sure that the o-ring is correctly positioned.
8. Lubricate the external thread (M77x1.5') of the
metering capsule with a fine silicone coating.
9. Lay the capsule in the base. Important! Make
sure that the blind hole in the metering capsule
is correctly positioned in the base.
10. Screw the measuring capsule down firmly by
hand, then tighten as far as the mechanical
end stop using a mounting tool.
11. Turn the display into desired position for read-
ing.
12. Seal the measuring capsule and temperature
sensors.
Coaxial multi jet meter with G2'' connection
4. Consider the direction of flow circulation (EAS
base).
5. Remove the blind cover or the old meter from
the EAS base using an installation spanner.
6. Remove the pre-formed gasket and then clean
the contact surfaces and the thread.
7. Place the new profiled gasket in the EAS base
with the plane surface facing upwards or the
groove in the preformed gasket facing down-
wards. Make sure that the gasket is properly
positioned.
8. Lubricate the external thread (G2'') of the
measuring capsule with a fine silicone coating.
9. Screw the measuring capsule down firmly by
hand. Then tighten as far as the mechanical
end stop using a mounting tool.
10. Turn the display into the desired position for
reading.
11. Seal the measuring capsule and the tempera-
ture sensors.
Declaration of conformity :
The detailed certificate of conformity can be consulted on the NZR website:
www.nzr.de
EC-Type examination certificate WZ-FC 778 : CH-MI004-13018
Nordwestdeutsche Zählerrevision Ing. Aug. Knemeyer GmbH & Co. KG, Heideweg 33, 49196 Bad Laer
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